2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/23/2019 | 9:15 AM - 9:30 AM | ECOHYDROLOGIC FEEDBACKS ON WEATHERING DRIVE KARST SELF-ORGANIZATION | 251 DE
ECOHYDROLOGIC FEEDBACKS ON WEATHERING DRIVE KARST SELF-ORGANIZATION
In karst landscapes such as Big Cypress National Preserve (BICY) in south Florida (USA), regular patterning of depressional wetlands arises from feedbacks among biota, water movement, and weathering. A new ecohydrologic model of weathering fronts in karst soils indicates that biogenic acidity accelerates weathering twenty-fold, but this biotic amplification depends critically on sustained inundation that slows atmospheric loss of CO2 and promotes transport of carbonic acid to bedrock. Model-derived estimates of an early Holocene initiation of depressions in BICY are supported by several lines of evidence, including contemporary rates of calcium export, accumulation of phosphorus in soils, paleoclimatic and paleoecological records, and radiometric carbon dating of insoluble organic sediment residues. Fine-scale water level dynamics indicate that seasonal surface flow dominates water export, but a model of long-term basin expansion suggests that export limitation does not occur until domes grow considerably larger than their current size. However, even at relatively modest sizes, basin expansion reduces inundation and thus weathering in adjacent uplands, and this feedback inhibits growth and coalescence of neighboring basins. This work illustrates the complex feedbacks that create varied morphologies of karst landscapes.
- Geomorphology
- Biogeochemistry
- Hydrology
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Presenters/Authors
Jim Heffernan
(), Duke University, james.heffernan@duke.edu;
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Matthew Cohen
(), University of Florida, mjc@ufl.edu;
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Daniel McLaughlin
(), Virginia Tech, mclaugd@vt.edu;
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A Brad Murray
(), Duke University, abmurray@duke.edu;
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Jon Martin
(), University of Florida, jbmartin@ufl.edu;
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Thomas Bianchi
(), University of Florida, tbianchi@ufl.edu;
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Todd Osborne
(), University of Florida, osbornet@ufl.edu;
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Xiaoli Dong
(), University of California - Davis, xldong@ucdavis.edu;
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Catherine Chamberlin
(), Duke University, catherine.chamberlin@duke.edu;
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Nicholas Ward
(), Pacific Northwest National Laboratory, nicholas.ward@pnnl.gov;
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Xiaowen Zhang
(), Massachussets Institute of Technology, xzhang15@mit.edu;
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Amy Brown
(), Suwannee River Water Management District, ALB@srwmd.org;
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Madison Flint
(), University of Florida, mflint@ufl.edu;
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Andrea Pain
(), University of Florida, ajpain@ufl.edu;
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Carlos Quintero
(), University of Florida, carlosjquintero@ufl.edu;
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